Only uses simplecov on MRI 1.9.
Only uses simplecov on MRI 1.9.

Rubinius in 1.9 mode has problems with it:

https://github.com/rubinius/rubinius/issues/1575
irfanah/vcr,ZmagoD/vcr,Shopify/vcr,chriswoodrich/vcr,asymmetric/vcr,ihassin/vcr,ihassin/vcr,myronmarston/vcr,ZmagoD/vcr,irfanah/vcr,cemo/vcr,cemo/vcr,allyapp/vcr,mcfiredrill/vcr,Shopify/vcr,nishanbose/vcr,allyapp/vcr,mcfiredrill/vcr,intfrr/vcr,davidbebb/vcr,davidbebb/vcr,intfrr/vcr,chriswoodrich/vcr,asymmetric/vcr,nishanbose/vcr,myronmarston/vcr